Add Closure as dependency in new Este.js

gistfile1.js

// package.json
{
  "devDependencies": {
    "google-closure-compiler": "^20150315.0.2",
    "google-closure-library": "^20150315.0.0",
    "gulp-closure-compiler": "^0.2.16"
  }
}

// gulpfile.js
gulp.task('closure', function() {
  return gulp.src([
    'node_modules/google-closure-library/closure/**/*.js',
    'src/lib/closure/src/**/*.js'
  ])
  .pipe(closureCompiler({
    compilerPath: 'node_modules/google-closure-compiler/compiler.jar',
    fileName: 'index.js',
    compilerFlags: {
      'closure_entry_point': 'index',
      'compilation_level': 'ADVANCED',
      'define': [
        'goog.DEBUG=false'
      ],
      'externs': ['src/lib/closure/externs.js'],
      'only_closure_dependencies': true,
      'output_wrapper': '(function(){%output%}).call(window);',
      'warning_level': 'VERBOSE'
    }
  }))
  .pipe(gulp.dest('src/lib/closure'))
})

// src/lib/closure/src/index.js
/**
 * @fileoverview Compile out Closure Library goodness.
 */

goog.provide('index')

goog.require('goog.dom.animationFrame')

exports['createAnimationFrameTask'] = function(mutate, opt_context) {
  return goog.dom.animationFrame.createTask({
    mutate: mutate
  }, opt_context)
}

// src/lib/closure/externs.js
/**
 * @type {Object}
 */
var module = {};

/**
 * @type {*}
 */
var exports;

/**
 * @type {Object.<string,*>}
 */
module.exports;

// src/client/components/app.jsx
import {createAnimationFrameTask} from '../../lib/closure'

// in componentDidMount method
this.animationFrameTask = createAnimationFrameTask(this.syncUI, this)
state.on('change', () => this.animationFrameTask());